CN100383600C - Optical lighting system and image projection system containing it - Google Patents
Optical lighting system and image projection system containing it Download PDFInfo
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- CN100383600C CN100383600C CNB2004100352806A CN200410035280A CN100383600C CN 100383600 C CN100383600 C CN 100383600C CN B2004100352806 A CNB2004100352806 A CN B2004100352806A CN 200410035280 A CN200410035280 A CN 200410035280A CN 100383600 C CN100383600 C CN 100383600C
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- light beam
- light
- refraction
- illuminating lens
- optical
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- G—PHYSICS
- G02—OPTICS
- G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
- G02B27/00—Optical systems or apparatus not provided for by any of the groups G02B1/00 - G02B26/00, G02B30/00
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- G—PHYSICS
- G02—OPTICS
- G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
- G02B19/00—Condensers, e.g. light collectors or similar non-imaging optics
- G02B19/0033—Condensers, e.g. light collectors or similar non-imaging optics characterised by the use
- G02B19/0047—Condensers, e.g. light collectors or similar non-imaging optics characterised by the use for use with a light source
- G02B19/0061—Condensers, e.g. light collectors or similar non-imaging optics characterised by the use for use with a light source the light source comprising a LED
- G02B19/0066—Condensers, e.g. light collectors or similar non-imaging optics characterised by the use for use with a light source the light source comprising a LED in the form of an LED array
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- G—PHYSICS
- G02—OPTICS
- G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
- G02B17/00—Systems with reflecting surfaces, with or without refracting elements
- G02B17/08—Catadioptric systems
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- G—PHYSICS
- G02—OPTICS
- G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
- G02B17/00—Systems with reflecting surfaces, with or without refracting elements
- G02B17/08—Catadioptric systems
- G02B17/0856—Catadioptric systems comprising a refractive element with a reflective surface, the reflection taking place inside the element, e.g. Mangin mirrors
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- G—PHYSICS
- G02—OPTICS
- G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
- G02B19/00—Condensers, e.g. light collectors or similar non-imaging optics
- G02B19/0004—Condensers, e.g. light collectors or similar non-imaging optics characterised by the optical means employed
- G02B19/0028—Condensers, e.g. light collectors or similar non-imaging optics characterised by the optical means employed refractive and reflective surfaces, e.g. non-imaging catadioptric systems
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- G—PHYSICS
- G02—OPTICS
- G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
- G02B19/00—Condensers, e.g. light collectors or similar non-imaging optics
- G02B19/0033—Condensers, e.g. light collectors or similar non-imaging optics characterised by the use
- G02B19/0047—Condensers, e.g. light collectors or similar non-imaging optics characterised by the use for use with a light source
Abstract
An optical illumination system and an image projection system including the same include a light source, at least one illuminating lens and a Mangin mirror that illuminate light emitted from the light source on a predetermined reflective device, the Mangin mirror including a concave refracting surface that refracts and transmits light incident from the illuminating lens, and a convex reflecting surface disposed behind the concave refracting surface to internally reflect the light refracted by the concave refracting surface back toward the concave refracting surface and tilted with respect to the illuminating lenses. The light reflected from the convex reflecting surface and then refracted through the concave refracting surface propagates along a path that is different from a path of the light emitted from the illuminating lens.
Description
Technical field
The present invention relates to a kind of being used for is transmitted into optical lighting system on the reflective display with micro-reflector with light, and light beam is opened or closed to described micro-reflector by changing reflection angle, and the optical projection system that comprises said system.
The application requires the right of priority at the korean patent application No.2003-21621 of Korea S Department of Intellectual Property submission on April 7th, 2003, and the disclosure of this application is incorporated herein by reference.
Background technology
Usually, the image projection system that is applied to the projector of rear projection television or front projection comprises optical lighting system, display device and projection optical system.The display device modulation is by the light beam of optical lighting system irradiation, and the light beam of projection optical system projection modulation, to show enlarged image.
Optical projection system develops into uses digital beam treatment (DLP) device, and this numeral light beam processing apparatus utilizes the manufacturing of microelectromechanical systems (MEMS) technology, as reflection type display device.This DLP device also is called digital micro-mirror device (DMD).
The DLP device that being used to of using in optical projection system produces image is a two-dimensional array of being made by a plurality of micro-reflectors, and each micro-reflector is represented single pixel.In order to produce image, drive each micro-reflector, make it in response to image signals corresponding, and open or close light beam by changing the reflection of incident light angle.
When the DLP device was used as reflected displaying device, in order to produce image, the formation of optical system made it be different from light path by DLP device beam reflected from the light path of optical lighting system emitted light beams and the light path that enters the DLP device.
Typically, in optical lighting system, use total reflection prism, separating from optical lighting system emitted light beams and the light beam of propagating to projection optical system.
U.S. Patent number US 5,604,624 discloses a kind of optical system that is used for Projection Display, and its structure makes from the light beam of light emitted and passes through total reflection prism, incides (there is called DMD) on the DLP device.
Usually, use the prism class optical projection system of total reflection prism separating light beam to constitute like this, make its total reflection prism be arranged in optical lighting system, so as the total reflection light beam and with light beam irradiates to reflection type display device.By reflected displaying device with the irradiation beam reflection in projection optical system.In this case, be mapped on the total reflection prism although enter the light beam of projection optical system, because little to the beam incident angle on total reflection prism surface, most of light beams are transmitted in the projection optical system.That is, under the total reflection condition of prism, the light beam that shines reflection type display device with separate by the reflection type display device beam reflected.
Quote as proof with reference to disclosed as above-mentioned, total reflection prism comprises two or more prisms, is used to separate the folded light beam from the light source irradiation light beam.In this case, make and assemble difform two or more prism.Each prism must be made has accurate angle.
Therefore, it is difficult making and assembling total reflection prism, and it has reduced manufacturing and assembling ability, thereby increases manufacturing cost.Between reflection type display device and projection optical system, the light beam that the total reflection prism face is left in reflection is tending towards entering projection optical system, and this has a negative impact to picture contrast.
Summary of the invention
In order to solve above-mentioned and/or other problem, an aspect of of the present present invention provides a kind of optical lighting system with simple structure, so that it is bad with the change that elimination is tending towards occurring in the optical system of total reflection prism class to reduce manufacturing cost, and the image projection system that comprises this system is provided.
An additional aspect of the present invention and an advantage part will occur in the following description, and a part will be apparent from this is described, and perhaps be to understand by the practice of the present invention.
By providing the optical lighting system that uses with image projection system to reach above-mentioned and/or others of the present invention, this image projection system comprises light source, at least one illuminating lens and Man Yin (mangin) catoptron that will be mapped to from the illumination of light emitted on the predetermined reflective devices, gracefully comprise that a refraction and transmission are from the recessed plane of refraction of the light of illuminating lens incident because of catoptron, with one be located at recessed plane of refraction back, be used for the light of recessed plane of refraction refraction is internally arrived to back reflective the protruding reflecting surface of recessed plane of refraction, and graceful because of the catoptron lens tilt of throwing light on relatively, from protruding reflecting surface reflection and then the light beam by recessed plane of refraction refraction along being different from from the optic path of illuminating lens emitted light beams.
Recessed plane of refraction has about 20 to 70mm negative radius-of-curvature, and protruding reflecting surface has about 30 to 100mm negative radius-of-curvature.
Light source can be a lamp ﹠ lantern, this system can further comprise an optical element that is arranged between light source and the illuminating lens, it is used for the Beam Transformation from light emitted is become uniform light beam, and the alteration of form of light beam is become another shape corresponding to the plane of reflective devices.
System can further comprise the color separated unit, and it is according to the light beam of wavelength separated from light emitted.
Reflective devices can be a reflected displaying device, and this display comprises the two-dimensional array of micro-reflector, and it is selectively to drive each micro-reflector with the light beam that shines in this mode that needed direction reflects.
Above-mentioned and/or others of the present invention are also by providing a kind of image projection system to reach, this system comprises an optical lighting system with a light source, at least one illuminating lens and one are used for graceful because of catoptron with on from the light beam irradiates of light emitted to reflected displaying device, graceful have a refraction and the transmission recessed plane of refraction from the light beam of illuminating lens incident because of catoptron, with one be located at recessed plane of refraction back, be used for the light of recessed plane of refraction refraction is internally arrived to back reflective the protruding reflecting surface of recessed plane of refraction, and this is graceful because of the catoptron lens tilt of throwing light on relatively, reach the light beam edge that reflects by recessed plane of refraction then from protruding reflecting surface reflection and be different from, so that light beam incides on the reflected displaying device obliquely from the optic path of illuminating lens emitted light beams.Reflected displaying device comprises the two-dimensional array of a micro-reflector, and it drives each micro-reflector with the beam reflection of selectively optical lighting system being shone to this mode of projection optical system, to form image on screen.
Above-mentioned and/or others of the present invention also by provide a kind of be used for image projection system have a reflective devices and a projection optical system optical lighting system reach, this optical lighting system comprises: a light source that is equivalent to the light beam of an image along the emission of first light path; Refraction and a reflector element with first and second, this refraction and reflector element are used for will reflecting to second along second light path from the light beam that light source receives by first, utilize second along the 3rd light path with the beam reflection of refraction to first, and along the light beam of the 4th light path to the reflected displaying device Transflective.
According to a further aspect in the invention, first, second, third is different mutually with the 4th light path.
According to a further aspect in the invention, the first, second, third and the 4th light path is not parallel.
According to a further aspect in the invention, the first and the 4th light path forms the angle less than 90 degree.
According to a further aspect in the invention, the second and the 3rd light path forms the angle less than 90 degree.
According to a further aspect in the invention, reflective devices and light source are oppositely arranged mutually about the route that is provided with between the first and the 4th light path.
According to a further aspect in the invention, first and second face are recessed, and in the face of light source and reflective devices, the distance at thickness phase birefringence between first and second and reflector element center is different.
According to a further aspect in the invention, each of first and second is the curved surface with different radii according to the distance to refraction and reflector element center.
According to a further aspect in the invention, refraction and reflector element further comprise the optical medium that is arranged between first and second, and according to the distance to refraction and reflector element center, its thickness difference.
According to a further aspect in the invention, refraction and reflector element comprise graceful because of catoptron.
Description of drawings
Of the present invention above-mentioned more apparent by describing preferred embodiment with reference to the accompanying drawings in detail with other feature and advantage, wherein:
Fig. 1 is the synoptic diagram that comprises the image projection system of optical lighting system according to embodiments of the invention;
Fig. 2 represents in the image projection system shown in Figure 1, from the divergent beams of each some emission of object plane by the illuminating lens convergence, by graceful because of mirror reflects and the light path that focuses in image planes;
Fig. 3 represents graceful aberration because of catoptron shown in Figure 1; With
Fig. 4 represents to have the aberration with graceful normal mirror because of radius-of-curvature like the mirror-like and other factor.
Embodiment
Now with reference to the example of representing with accompanying drawing, describe embodiments of the invention in detail, wherein same reference numbers is represented components identical.Below in order to explain that the present invention describes its embodiment with reference to the accompanying drawings.
Fig. 1 represents to have according to an embodiment of the invention the image projection system of optical lighting system 1.With reference to Fig. 1, optical lighting system comprises that a light source 10, at least one illuminating lens 40 and one are graceful because of catoptron 50, described gracefully will shine on the predetermined reflection unit from light source 10 emitted light beams because of catoptron 50.Except optical lighting system 1, image projection system also comprises a reflected displaying device 60, and this display is the reflection unit and a projection optical system 70 of being scheduled to.
In Fig. 1, optical element 30 is light beam tunnels 31, that is, a glass bar, color separated unit 20 comprise one can be by the colour wheel 22 of drive source 21 rotation.
With reference to Fig. 2, the exit facet 31b emitted light beams that illuminating lens 40 is assembled from light beam tunnel 31, that is, and object plane 35.Graceful because of catoptron 50 then according to the pitch angle of reflected displaying device 60, the light path and the light path of optical lighting system 1 of projection optical system 70 are separated, graceful because of catoptron 50 are digital light beam processing apparatus (DLP).In order to reach this purpose, graceful because of catoptron 50 relative illuminating lenss 40 inclinations.That is to say, form predetermined angular the graceful optical axis c1 because of the central shaft c 2 of catoptron 50 and 40 prolongations from light source 10 to illuminating lens.
Gracefully, catoptron 50 places protruding reflecting surface 53 behind the recessed plane of refraction 51 from the recessed plane of refraction 51 of the light of illuminating lens 40 and one because of having a refraction.Optical medium with predetermined refraction is between recessed plane of refraction 51 and protruding reflecting surface 53.For example, graceful because of catoptron 50 can be that its rear surface is the crescent of reflecting surface.Note disclosed by the invention gracefully, be not limited only to that this is graceful because of catoptron, but can use arbitrary other refraction and reflection-type unit, the aspect that the present invention wants is provided here and/or is used as open because of catoptron just is used for illustrated purpose.
When recessed 51 refraction and the transmission incident light time of plane of refraction, protruding reflecting surface 53 internally arrives recessed plane of refraction 51 to back reflective with the light of recessed plane of refraction 51 refractions.In this case, protruding reflecting surface 53 entire emission surface preferably.
When according to present embodiment, when utilizing reflected displaying device 60 to be added to lighting system 1 in the image projection system, recessed plane of refraction 51 can have about 20 to 70mm negative radius-of-curvature, and protruding reflecting surface 53 can have about the 30 negative radius-of-curvature to the 100mm scope.In this case, because these surperficial directions, so recessed plane of refraction 51 and protruding reflecting surface 53 are radius-of-curvature of bearing.At optical field, the radius-of-curvature of lens or mirror surface can be positive or negative, and this depends on the direction on surface.
When utilizing have recessed plane of refraction 51 and a protruding reflecting surface 53 graceful during as mentioned above because of catoptron 50, from protruding reflecting surface 53 beam reflected by recessed plane of refraction 51 refractions, and along being different from from the optic path of illuminating lens 40 emitted light beams.
As shown in Figure 2, the divergent beams that the every bit from object plane 35 (the exit facet 31b in light beam tunnel 31 as shown in Figure 1) penetrates have illuminating lens 40 and Man Yin catoptron 50 to assemble, to focus on the image planes 65, promptly on the reflected displaying device 60.
Obviously pass through Fig. 1 and 2, for example, from object plane 35, promptly the light beam that penetrates from the exit facet 31b in light beam tunnel 31 is assembled by illuminating lens 40, and, be input on the reflected displaying device 60 with suitable angle by convergence, graceful refraction and reflex because of catoptron 50.
Because gracefully be used as lens and catoptron because of catoptron 50, so this quantity that can reduce required optical element constitutes optical lighting system 1.
In order to show graceful fabulous performance because of catoptron 50, it is graceful because of catoptron 50 with have aberration with graceful normal mirror because of radius-of-curvature like the mirror-like that Fig. 3 and 4 represents to have certain radius of curvature respectively.
Fig. 3 represents to be-60mm when the radius-of-curvature of recessed plane of refraction 51 and protruding reflecting surface 53, and-95mm object distance is that 150mm, effective focal length length (EFL) are 60mm, are 20 when spending in the incident angle of image planes 65, graceful aberration because of catoptron 50.
Fig. 4 represent the radius-of-curvature when normal mirror be-94mm, object distance are that 150mm, effective focal length are 60mm, are 20 when spending in the incident angle of image planes, the aberration of normal mirror.
Between Fig. 3 and Fig. 4 result relatively is significantly, uses gracefully because of catoptron 50 can reduce aberration, and it is also littler than half of the aberration of the normal mirror of use conditions of similarity.Simultaneously, the optical module that comprises between light source 10 and the illuminating lens 40 is not limited to shown in Figure 1 those, can carry out various changes.
Be arranged to big or small consistent with effective viewing area of reflected displaying device 60 by the size of the light beam of optical lighting system 1 irradiation.In addition, the light beam of irradiation is equally distributed.
Therefore, because optical lighting system 1 of the present invention is radiated at light beam on the reflected displaying device 60 obliquely, so therefore the light beam of irradiation allows the DLP device can be used as reflected displaying device 60 with then different by the path of reflected displaying device 60 beam reflected on reflected displaying device 60.
Therefore, an aspect of of the present present invention is to use the DLP device as reflected displaying device 60 in comprising the image projection system of optical lighting system.That is to say that in an embodiment of the present invention, reflected displaying device 60 can be the DLP device, it has the two-dimensional array of micro-reflector, and it is selectively to drive the light beam that shines in this mode that needed direction reflects.In reflected displaying device 60, each micro-reflector is equivalent to a pixel.
Can be equivalent to the path reflection of the route that the micro-reflector of independent pixel is tilted along dependence by the light beam of optical lighting system 1 irradiation.When the micro-reflector that is equivalent to intended pixel is opened,, and be projected that lens unit 71 amplifies and to screen 80 transmissions by of projecting lens unit 71 transmission of micro-reflector beam reflected to projection optical system 70.On the contrary, when closing micro-reflector, be drawn towards away from projecting lens unit 71 from the micro-reflector beam reflected.
Therefore, in order to produce image, reflected displaying device 60 drives each independently and is catoptron, with the picture signal in response to each pixel, opens or closes the light beam of micro-reflector by the reflection angle that changes micro-reflector.The image that is produced by reflected displaying device 60 is projected lens unit 71 amplifications, and projects on the screen 80.Here, surpass 90% incident light, provide high optical efficiency so have the reflected displaying device 60 of DLP device because micro-reflector can reflect.In addition, the reflected displaying device 60 with DLP device provides fast response device, therefore makes it can respond the picture that moves more natural and glibly than traditional LCD.
Image projection system according to the present invention can be used in the projector of rear projection television and front projection.
Although optical lighting system 1 comprises the lamp ﹠ lantern light source of launching white light as light source 10, the embodiment that is not limited to propose here.That is to say that in optical lighting system 1, light source 10 can be the LED of white light, a plurality of each LED or a plurality of each LD for colour for colour.In this case, therefore the optical texture of optical lighting system 1 can change.
As mentioned above, for the light path of separating incident light on reflected displaying device, just the DLP device isolation catoptrical light path, comprise having the graceful of lens and catoptron effect because of catoptron, therefore the structure that obtains simplifying has reduced the quantity of the required optical module of optical lighting system.
Therefore, use graceful optical lighting system to be easy to make and optical alignment, and relatively have low manufacturing cost with traditional total reflection prism class optical system because of catoptron.
In addition,, eliminated the reduction that traditional total reflection prism class is tending towards the picture contrast that occurs easily, and prevented the optical loss that conventional prism occurs, therefore made the illumination efficiency maximization because use gracefully because of catoptron replaces prism.
Although illustrated and described some embodiments of the present invention, those skilled in the art will be appreciated that on the various forms of the spirit and scope of the present invention that can not deviate from accessory claim and limited and be equal to it and the change on the details.
Claims (10)
1. optical lighting system with a reflective devices that is used for image projection system comprises:
A light source;
At least one illuminating lens, being used for will be from the light beam irradiates of light emitted to reflective devices, wherein said reflective devices comprises reflected displaying device, this display comprises the two-dimensional array of micro-reflector, selectively the light beam that shines is driven each micro-reflector in this mode that needed direction reflects;
Graceful because of catoptron, it tilts with respect to illuminating lens, and the light beam that will pass illuminating lens transmits to reflective devices;
The color separated unit, it is according to the wavelength separated of the light beam light beam from light emitted;
Wherein gracefully comprise that a refraction and transmission are from the recessed plane of refraction of the light of illuminating lens incident because of catoptron, with one be located at recessed plane of refraction back, be used for the light of recessed plane of refraction refraction is internally arrived to back reflective the protruding reflecting surface of recessed plane of refraction, be different from from the optic path of illuminating lens emitted light beams by the light beam edge of recessed plane of refraction refraction then from protruding reflecting surface reflection.
2. optical lighting system as claimed in claim 1, its concave plane of refraction have about 20 to 70mm negative radius-of-curvature, and protruding reflecting surface has about 30 to 100mm negative radius-of-curvature.
3. as claim 1 or 2 described optical lighting systems, wherein light source comprises the lamp ﹠ lantern light source, this system can further comprise an optical element that is arranged between light source and the illuminating lens, it is used for the Beam Transformation from light emitted is become uniform light beam, and the alteration of form of light beam is become another shape corresponding to the plane of reflective devices.
4. optical lighting system as claimed in claim 3, wherein optical element comprises a light beam tunnel.
5. optical lighting system as claimed in claim 1, wherein said color separated unit comprises:
A colour wheel, it also sequentially transmits the light beam of this separation from the light beam of light emitted according to the wavelength separated of light beam; With
A drive source that makes the colour wheel rotation.
6. image projection system comprises:
A reflected displaying device; With
An optical lighting system, this optical lighting system comprise,
A light source,
At least one illuminating lens, be used for from the light beam irradiates of light emitted to reflected displaying device,
Graceful because of catoptron, it tilts with respect to illuminating lens, and the light beam irradiates that will pass illuminating lens is to reflected displaying device;
A color separated unit, it is according to the wavelength separated of the light beam light beam from light emitted;
Wherein gracefully comprise a refraction and transmission recessed plane of refraction because of catoptron from the light beam of illuminating lens incident, with one be located at recessed plane of refraction back, be used for the light of recessed plane of refraction refraction is internally arrived to back reflective the protruding reflecting surface of recessed plane of refraction, be different from from the optic path of illuminating lens emitted light beams so that reach the light beam edge that reflects by recessed plane of refraction then, make light beam incide on the reflected displaying device obliquely from protruding reflecting surface reflection; This reflected displaying device comprises the two-dimensional array of a micro-reflector, drives each micro-reflector with the beam reflection of selectively optical lighting system being shone to this mode of projection optical system, to form image.
7. image projection system as claimed in claim 6, its concave plane of refraction has about 20 to 70mm negative radius-of-curvature, and protruding reflecting surface has about 30 to 100mm negative radius-of-curvature.
8. as claim 6 or 7 described image projection systems, wherein light source comprises the lamp ﹠ lantern light source, this system further comprises an optical element that is arranged between light source and the illuminating lens, it is used for the Beam Transformation from light emitted is become uniform light beam, and the alteration of form of light beam is become another shape corresponding to the plane of reflective devices.
9. image projection system as claimed in claim 8, wherein optical element comprises a light beam tunnel.
10. image projection system as claimed in claim 6, wherein said color separated unit comprises:
A colour wheel, it also sequentially transmits the light beam of this separation from the light beam of light emitted according to the wavelength separated of light beam; With
A drive source that makes the colour wheel rotation.
Applications Claiming Priority (3)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| KR1020030021621A KR100833230B1 (en) | 2003-04-07 | 2003-04-07 | Illumination optical system and image projection system applied it |
| KR21621/03 | 2003-04-07 | ||
| KR21621/2003 | 2003-04-07 |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN1536391A CN1536391A (en) | 2004-10-13 |
| CN100383600C true CN100383600C (en) | 2008-04-23 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CNB2004100352806A Expired - Fee Related CN100383600C (en) | 2003-04-07 | 2004-04-07 | Optical lighting system and image projection system containing it |
Country Status (4)
| Country | Link |
|---|---|
| US (1) | US6908199B2 (en) |
| JP (1) | JP2004310106A (en) |
| KR (1) | KR100833230B1 (en) |
| CN (1) | CN100383600C (en) |
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- 2003-04-07 KR KR1020030021621A patent/KR100833230B1/en not_active IP Right Cessation
-
2004
- 2004-04-06 JP JP2004111919A patent/JP2004310106A/en active Pending
- 2004-04-06 US US10/817,802 patent/US6908199B2/en not_active Expired - Fee Related
- 2004-04-07 CN CNB2004100352806A patent/CN100383600C/en not_active Expired - Fee Related
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Also Published As
| Publication number | Publication date |
|---|---|
| CN1536391A (en) | 2004-10-13 |
| KR20040087411A (en) | 2004-10-14 |
| JP2004310106A (en) | 2004-11-04 |
| KR100833230B1 (en) | 2008-05-28 |
| US20040212789A1 (en) | 2004-10-28 |
| US6908199B2 (en) | 2005-06-21 |
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